. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VM VM. FIGURE 2. Late larval development and early metamorphosis in Cnthoiw innia: a-c) veli- ger with developing shell; d) veliger with complete shell and mantle withdrawn back inside of the shell; e) late veliger retracted into the shell at the stage of development at hatching; and f) early metamorphosis after loss of the velum. AC indicates the anal cells ; E, the eye; F, the metapodium ; MF, the mantle fold ; OP. the operculum; PR, the propodium ; RM, the retractor muscle; SH, the shell; ST, the statocyst; SV, the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. VM VM. FIGURE 2. Late larval development and early metamorphosis in Cnthoiw innia: a-c) veli- ger with developing shell; d) veliger with complete shell and mantle withdrawn back inside of the shell; e) late veliger retracted into the shell at the stage of development at hatching; and f) early metamorphosis after loss of the velum. AC indicates the anal cells ; E, the eye; F, the metapodium ; MF, the mantle fold ; OP. the operculum; PR, the propodium ; RM, the retractor muscle; SH, the shell; ST, the statocyst; SV, the suhvelar ridge; V, the velum; and YM, the visceral mass. Yelar locomotor cilia not shown. mantle cavity, and only when the mantle has regressed three quarters of the way to the apeyi of the shell (Fig. 2d) can the velar lobes be entirely withdrawn. Normally, the foot is never fully retracted with the operculum closing the shell opening. Chemical irritants such as alcohol canst the veliger to retract beyond the normal restrictions of the mantle fold or even to draw the foot into the shell, but only at concentrations that kill the larva. Two red eyespots become visible on the fifteenth day. A day later, the pro- podium begins to form, just ventral to the mouth (Fig. 2d). At this stage the mantle has migrated two-thirds of the way back from the shell aperture. The sub-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
